Results 61 to 70 of about 786,932 (316)
Strong gravitational lensing by wormholes [PDF]
Journal of Cosmology and Astroparticle Physics, 2019 We study strong gravitational lensing by a class of static wormhole geometries. Analytical approaches to the same are developed, and the results differ substantially from strong lensing by black holes, first reported by Bozza.
R. Shaikh +3 more
semanticscholar +1 more source
Cluster Cosmology Constraints from the 2500 deg2 SPT-SZ Survey: Inclusion of Weak Gravitational Lensing Data from Magellan and the Hubble Space Telescope [PDF]
Astrophysical Journal, 2018 We derive cosmological constraints using a galaxy cluster sample selected from the 2500 deg2 SPT-SZ survey. The sample spans the redshift range 0.25 < z < 1.75 and contains 343 clusters with SZ detection significance ξ > 5.
S. Bocquet +94 more
semanticscholar +1 more source
Evolving Morphology of Resolved Stellar Einstein Rings
The Astrophysical Journal, 2023 We consider strong gravitational lensing by nearby stars. Using our wave-optical treatment of lensing phenomena, we study Einstein rings that may form around nearby stellar lenses.
Slava G. Turyshev, Viktor T. Toth
doaj +1 more source
Gravitational lensing reveals ionizing ultraviolet photons escaping from a distant galaxy [PDF]
Science, 2019 Ionizing photons escape a lensed galaxy Young, hot stars emit ultraviolet radiation, which can ionize a neutral gas. The first generation of stars converted most of the intergalactic gas in the Universe from neutral to ionized form during the epoch of ...
T. Rivera-Thorsen +11 more
semanticscholar +1 more source
Gravitational Lensing in Plasma [PDF]
Proceedings of 25th Texas Symposium on Relativistic Astrophysics — PoS(Texas 2010), 2011 We develop a model of gravitational lensing in plasma. We show that the gravitaional deflection angle by point mass in the homogeneous plasma differs from the vacuum deflection angle and depends on frequency of the photon. The dependence of the lensing angle on the photon frequency in the homogeneous plasma resembles the properties of a refractive ...
Oleg Yu. Tsupko +1 more
openaire +3 more sources
Gravitational Lensing Signatures of Axion Dark Matter Minihalos in Highly Magnified Stars [PDF]
Astronomical Journal, 2019 Axions are a viable candidate for cold dark matter, which should generically form minihalos of subplanetary masses from white-noise isocurvature density fluctuations if the Peccei–Quinn phase transition occurs after inflation.
Liang Dai, J. Miralda-Escud'e
semanticscholar +1 more source
Strong gravitational lensing of explosive transients [PDF]
Reports on progress in physics. Physical Society, 2019 Recent rapid progress in time domain surveys makes it possible to detect various types of explosive transients in the Universe in large numbers, some of which will be gravitationally lensed into multiple images. Although a large number of strongly lensed
M. Oguri
semanticscholar +1 more source
The Astronomical Journal, 2023 The Superpressure Balloon-borne Imaging Telescope ( SuperBIT ) is a diffraction-limited, wide-field, 0.5 m, near-infrared to near-ultraviolet observatory designed to exploit the stratosphere’s space-like conditions.
Jacqueline E. McCleary +25 more
doaj +1 more source
Effect of gravitational lensing on the distribution of gravitational waves from distant binary black hole mergers [PDF]
Monthly notices of the Royal Astronomical Society, 2018 The detailed observation of the distribution of redshifts and chirp masses of binary black hole mergers is expected to provide a clue to their origin.
M. Oguri
semanticscholar +1 more source
Symposium - International Astronomical Union, 1993 In approximately half the systems currently recognized as strongly gravitationally lensed, the background object is an extragalactic radio source. Radio observations have played an important role in the identification of lensed systems, and the properties of radio sources allow some of the astrophysical applications of lensing to be realized.
openaire +2 more sources